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(No Model.) J. A. TRAUT.

SIGHTINE ATTACHMENT FOR SPIRIT LEVELS. v No. 405,624. Patented June 18,1889.

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UNITED STATES PATENT OFFICE.

JUSTUS A. TRAUT, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE STANLEYRULE AND LEVEL COMPANY, OF SAME PLACE.

SIGHTING ATTACHMENT FOR SPIRIT-LEVELS.

SPECIFICATION forming part'of Letters TPatent No. 405,624, dated June18, 1889.

Application filed January 22, 1889. Serial No. 297,203. (No model) Toall whom it may concern:

Be it known that I, JUsTUs A. TEAUT, a citizen of the United States,residing at New Britain, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inSighting-Levels, of which the following is a specification.

My invention relates to improvements in levels or analogous paralleledges, bars provided with sighting attachments; and the objects of myinvention are to produce a level with adjustable bases for saidattachments.

In the accompanying drawings, Figure 1 is a plan view of the two ends ofa spiritlevel with my attachments applied thereto. Fig. Fig. 3 is avertical section of the near sight and that end of the level, the planeof section being 011 the line w w of Fig. 1, the screws being shown inelevation. Fig. 4 is a front elevation of the farther sight, and Fig. 5is a side elevation of the base for said sights.

A A designate the respective ends of a level-stock, in the upper edgesof which at each end I drill a vertical hole, taking pains that it shallbe drilled accurately true and square with the stock.

(3 designates a base, the lower portion 7 of which is cylindrical and ofa size which will snugly fill said holes in the upper edge of the stock.Above the cylindrical portion of this base there is a threaded portion8, which projects slightly beyond the cylindrical portion, and the upperend of the base is provided with an ordinary slot or nick 9, for turningsaid base with a screw-driver. The base is also perforated centrally andthreaded to receive the body of the holding-screw 10. This base isplaced with its cylindrical portion in the hole in the stock, which holeand cylindrical portion,being specially fitted to each other, will guidethe base and cause it to enter the hole in the proper direction, so asto insure that its upper end will be sub stantially parallel, to theupper face of the stock. By turning said base with a screwdriver it maybe screwed into the stock to the desired depth. There is one such basein each end of the stock. By the aid of base of the stock.

be sunk a little below said upper face of the stock, or at least left soas not to project above said face when the level is used without thesighting attachments.

The sighting attachments are each pro vided with a base-plate 11, havinga perforation for the passage of the holding-screw 10 into thecentrally-threaded hole of the base 6, the under side of said base-platebe ing made true and square, and, preferably, with a slightly-'projecting circular seat,which will fit the upper end of the bases 6, and ofa size which will permit said seat to be sunk slightly below the upperface of the level stock, the perforation for the holding-screw beingcentrally located with reference to said seat. Each base-plate 11 isprovided with an upright and sight, the upright 12 being provided with asmall hole for the near sight, and the uprigl'it 13 being provided witha hair-line 14, adapted for use as a farther sight. The sights ofthemselves are of ordinary construction and for well-known uses. Thesesights may be attached to and detached from the level by means of theholding-screws,which screws are short enough not to interfere with thesights.

The bases 6 may remain permanently in the stock, and they formadjustable bases, by means of which the parallelism of the sights to thebase of the level-stock may always be maintained.

I claim as my in vention- 1. The combination of a level stock or barwith the bases 6 6, adjustable with reference to a given surface of saidstock or bar, the sights adapted to be seated upon the face of saidbases, and devices for attaching said sights to and detaching them fromsaid bases, substantially as described, and for the purpose specified.

2. The combination of a level stock or bar, the non projecting bases 66, adjustable with reference to a given surface of said bar or stock andprovided with a threaded hole, the holding-screws 10, and the sightingattachments having a projecting seat upon the under side of theirbase-plates for resting upon said bases 6 6, substantially as described,and for the purpose specified.

JUSTUS A. TRAUT.

\Vitnesses:

F. N. STANLEY, H. S. WALTER.

